Another notable film in Estregan's repertoire is the 1980 movie "Minsa'y Isang Lahi," a historical drama that explores the struggles of the Filipino people during the Japanese occupation. In this film, Estregan plays a resistance fighter who becomes embroiled in a web of espionage and betrayal. The movie's intense action sequences and dramatic plot twists showcase Estregan's versatility as an actor and his ability to tackle complex, thought-provoking material.